Thanks to blogger Reed Coleman, who first tracked it down, and to the New York Daily News for confirming it was indeed Lanza, we can listen to the killer’s voice and get a measure of a madness that was all the more horrifying because he was remarkably articulate and seemingly logical.

In the nearly seven-minute segment, the caller -- who identifies himself as "Greg" and speaks in a low, clipped monotone -- laments perceptions of a chimpanzee who was shot by Stamford police for mauling his owner's friend after the attack, which he said didn't happen "simply because he was a senselessly violent, impulsive chimp."

No one can confirm the voice is actually Lanza's, but but if it is his, it could provide previously unknown insight into the mind of the 20-year-old, who killed 26 people at the Newtown, Connecticut, school before killing himself as police closed in.

'Hey listen, there is going to be another shooting, there is going to be another outbreak of violence,'" clinical psychologist Jeff Gardere told CNN, assuming the voice is that of Lanza. Continuing with what he believed the caller meant, Gardere added, "But it's not as random as you think it is. There's a reason that these things happen."

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